Help - difference in percentage of the first value

Configuration
1

Hi,

I’ve got a numeric value which is basically an euro valuta: € 1000,- this doesn’t change.
Another value (in euro) does change every now and then.

I want to know the difference in percentage of the first value.
How can I set this up?

Is a numeric helper a way to go? I don’t think so because then I need to define a step size…

2

Use a template sensor.

3

How to set up the first value? the value that doesn’t change.

I think that I need to have a statistics sensor a “state characteristic change”
and a template sensor that gives me the percentage, but I don’t know how to define the static numeric value.

4

You don’t have to define numeric constants, you just use them in your templates.

template:
  - sensor:
      - name: "Percent difference from 1000"
        state: "{{ 100 * ( 1000 - states('sensor.your_sensor_here')|float(0) ) / 1000 }}"
        unit_of_measurement: "%"
        availability: "{{ states('sensor.your_sensor_here')|is_number }}"
5

Ty for the suggestion. If the static value of 1000 changes in the future, do I only need to change the 1000 in the state line (twice)?

6

Nevermind.
My phone refused to scroll completely to the right. :frowning:

And yes replace 1000 twice in the calculation.

7

If the static value changes then it is not static and you should use an input number helper so that you can change it from your dashboard.

template:
  - sensor:
      - name: "Percent difference from a non-static number"
        state: "{{ 100 * ( states('input_number.your_non_static_number')|float(0) - states('sensor.your_sensor_here')|float(0) ) / states('input_number.your_non_static_number')|float(0) }}"
        unit_of_measurement: "%"
        availability: "{{ states('sensor.your_sensor_here')|is_number and states('input_number.your_non_static_number')|is_number }}"
1 Like
8

I’m testing with this but I get a not expected outcome of 96,07%
I have set the input number to 100 and the “sensor.you_sensor_here” is currently 3,93 €

But it should be 2444 % (rounded), right?
I’ve used Percentage Calculator (%)
from 3,93 to 100 = 2444.5292620865134%

9

Try this:

state: "{{ 100 * ( states('input_number.your_non_static_number')|float(0) - states('sensor.your_sensor_here')|float(0) ) / states('sensor.your_sensor_here')|float(0) }}"
10

((value1 - value2) / value1) * 100

11

Nope.

((value2 - value1) / value1) * 100

( 100 - 3.93 ) / 3.93 ) * 100 = 2444

Which is what I wrote.

12

My suggestion is calculating the percentage difference in relation to the value first value.
Tom_l’s suggestion is calculating the percentage difference in relation to the second value.

Both are valid. It is a question of what the person wants of view.

13

ok to make it concrete. I have a break even amount on investments that is 3.5 euros. if the share price reaches 4 euros, I want to know how many percent it has gone up or down

Hm two suggestions, not sure which one I’m looking for haha

14

((4,0 - 3,5) / 3,5) * 100%= 14,28571428571%

3,5 * 14,28571428571% = 0,5

15

They told us. There is no question.

16

Thank you both!